PWSRCAC Response System Optimization Project Response System Optimization Project PWS RCAC Board...

PWSRCACResponseSystemOptimization

Project

PWSRCACBoardMeetingMeeting

May4,2017

ResearchQuestion

• Whatistheoptimalconfigurationofcontainment,skimming,andstorage(primaryandsecondary) forninePWSrecoverysystems(threeopen-waterandsixnearshore)overafive-daysimulatedspillresponseassumingfavorableweatherconditions?

WeirSkimmer

Oleophilic DiscSkimmer

Scenario

OperationalPeriods

WhatAreWeOptimizing?

• Theamountofoilrecoveredforagivenoperationalperiod

• TryingtomatchDe-ratedEncounterRatewithDe-ratedSkimmerRateandmakebothashighaspossible

RESULTS

• Open-WaterResponseSystems– BaseCase– Optimized

• Nearshore ResponseSystems– BaseCase– Optimized

• SecondaryStorageAnalysis– Nearshore

RecoveredFluids

TRANSREC/GRAMREC - BASECASE

38,067bbl

CB8BARGE- BASECASE

53,012bbl

VALDEZSTAR- BASECASE

14,290bbl

TRANSREC/GRAMREC - OPTMIZE

CB8BARGE- OPTIMIZE

VALDEZ STAR- OPTIMIZE

NEARSHORE BASECASE

0

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 10

BBL

OP

0

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 100

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 10OP

0

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 100

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 10OP

0

5000

10000

15000

20000

25000

1 2 3 4 5 6 7 8 9 10

BBL

FreeWater

WaterinEmulsion

Oil

CB4

CB2

J-boo

m

Weir Disc

BBL

BBL

BBL

OP OP

2,236bbl

1,573bbl

2,236bbl

2,076bbl

1,860bbl

593bbl

CB4WEIR- OPTIMIZE

CB4DISC- OPTIMIZE

CB2WEIR- OPTIMIZE

CB2DISC- OPTIMIZE

J-BOOMWEIR- OPTIMIZE

EssentiallythesameasCB4Weir

SECONDARYSTORAGE-OPTIMIZE

SecondaryStorageOptimalOperatingAreaSizefor10OffloadStations

SecondaryStorageModel

RadiusXnm

SecondaryStorageModel

SecondaryStorageBarge

SecondaryStorageModel

SkimmingSystem

PrimaryStorageBarge

SecondaryStorageModel

SecondaryStorageModel

SecondaryStorageModel

SecondaryStorageModel

SecondaryStorageModelInputs:• Radius• Slickthickness• OPlength• Timesteplength• Numberandspecs.ofskimmingsystems• Numberandspecs.ofmini-barges• Numberofoffloadstations• Numberofiterations

Outputs:• Statusofeverythingateachtimestep• Totalfluidsrecovered• Totaloilrecovered

SecondaryStorageModelScenarios:• Assumed120vesselsinascenario• Variednumberofskimmersandandmini-bargestoutilizeall120vessels(eachskimmingsystemuses3vesselsandeachmini-bargeusesonevessel)• e.g.20skimmersand60mini-barges(20x3+60=120)• Raneverycombinationfrom

• zeroskimmers,120mini-barges• 60skimmers,zeromini-barges

• Ranforweirskimmingsystemwith10and18offloadstationsonsecondarystoragebarge• Ranfordiscskimmingsystemwith6and10offloadstationsonsecondarystoragebarge• Ranfor2nmto40nmradius• Raneachscenario100times

SecondaryStorageModel

0 40

20 skimmers60 mini-barges

19,419 bbl

18 Offload StationsWEIR SKIMMERS

2 nm area

SecondaryStorageModel

00 40

14 skimmers78 mini-barges

13,040 bbl

10 Offload StationsWEIR SKIMMERS

2 nm area

SecondaryStorageModel

0 40

Mini-barge-limitedSkim

mer-lim

ited

18 Offload StationsWEIR SKIMMERS

2 nm area

SecondaryStorageModel

00 40

Mini-barge-limited

Skimmer

-limited

Station-limited

10 Offload StationsWEIR SKIMMERS

2 nm area

SecondaryStorageModel

SecondaryStorageOptimal

WeirSkimmingSystems

SecondaryStorageOptimal

DiscSkimmingSystems

SecondaryStorageOptimalDecantingMini-Barges

• InOP4aweirskimmercanfillamini-bargein22minutes• Whenfull,themini-bargewillhold189bbl offree-water• Thecapacityofthede-cantpumpis17bbl/hr• Thusitwillrequire8.9hourstodecant80%ofthatfree-water

• ConsideringthetimeitwouldtakerunbackandforthtotheSecondaryStorageBargeat5kts,rig/de-rig,andpump-outthemini-barge,themini-bargewouldhavetobeatleast20.8nmawayfromtheSecondaryStorageBargefordecantingtomakesense.

Considerations• Potentialoilrecoveryisvaluableasacomparativemetriconly.

• Real-worldtestingandtrainingarecritical.

• Oilpropertiesandweatherconditionsimpactresults.

• Realisticequipmentassumptionsarecritical.

• Resultsregardingdiscskimmerscouldapplytooleophilicskimmersgenerally.

FINDINGS• Oleophilic skimmershavesignificantadvantagesoverweirskimmersduetothelackoffree-waterrecovered.

• Thesoonersystemsaredeployedthebettertotaloilrecoverywillbefortheresponse.

• Open-watersystemsareencounterratelimited.Improvementstothesesystemscanbeachievedbyincreasingtheswath-width.

FINDINGS• Nearshore systemsarepumpratelimitedandcanbeimprovedbyincreasingskimmercapacity.

• Secondarystoragewillrequiremoreoffloadstationsifweirskimmersareused,comparedtodiscskimmers.

• Theoptimalconfigurationforweirskimmingsystemsis18offloadstations,20skimmingsystemsand60mini-barges.

• Theoptimalconfigurationfordiscskimmingsystemsis10offloadstations,26skimmingsystemsand42mini-barges.

FINDINGS• Totaloilrecoverdeclinesbyabout2%pernmfromthesecondarystoragebarge.

• Largeoperatingareasrequiremoremini-bargestooperateefficiently.

• Decantingmini-bargesisnotefficient.